ES2236660T3 - COMPOSITIONS OF REDISPERSABLE POLYMER POWDER IN WATER WITH FRAGUATED ACCELERATING EFFECT. - Google Patents

Abstract

Compositions of water redispersible polymer powders with accelerating setting action based on homo- or copolymers of one or more monomers of the group comprising vinyl esters of unbranched or branched alkylcarboxylic acids with 1 to 15 C atoms, methacrylic acid esters and esters of acrylic acid of alcohols with 1 to 15 C atoms, vinyl aromatic compounds, olefins, dienes and vinyl halides, which do not contain any substituents of the group comprising aldehyde, ketone, epoxide, isocyanate, carboxylic acid anhydride and aziridine groups, one or several protective colloids, and optionally anti-blocking agents, characterized in that one or more NR3 or R2N- (CH2) n-NR2 compounds with n = 1 to 4 are contained, where the R moieties are the same or different, and have the meaning of hydrogen, C1 to C6 alkyl moiety and C1 to C6 hydroxyalkyl moiety, at least one R moiety being a C1 to C6 hydroxyalkyl moiety, or one is contained or several polyalkylene glycols terminated simply or doubly in NH2 with C1 to C6 alkylene groups, and the compounds NR3, R2N- (CH2) n-NH2 as well as the polyalkylene glycols terminated in NR2 may also be present in the form of their salts.

Description

Polymer Powder Compositions Redispersible in water with accelerating setting.

The invention relates to powder compositions of polymer redispersible in water with accelerating effect of setting, processes for their production, and the use of these powders in hydraulic setting systems.

Polymers based on vinyl esters, chloride vinyl, monomers of (meth) acrylate, styrene, butadiene and ethylene is used primarily in the form of its aqueous dispersions or water-reusable polymer powders in numerous applications, for example as coating agents or binders for more diverse substrates. For the stabilization of these polymers, employ protective colloids or compounds with surface activity low molecular weight As protective colloids are used by general rule poly (vinyl alcohols).

These products find particular application as binders in adhesives that forge hydraulically, by example in tile adhesives based on cements or plasters.

The concrete active material is an active material very versatile whose properties can be controlled by a multiplicity of parameters. Important properties are among others ease of processing over time and resistance (early and final resistance) of concrete. Due to hydration of the mass that takes place, the ease of processing decreases over time. To counteract this effect can be added, or more water, or the so-called fluidizers or superplasticizers. Both factors lead however to the initial resistance and Concrete finish will be adversely influenced. For to compensate for these inconveniences, the so-called accelerators or early resistance promoters, which lead to higher initial and final resistance.

In EP-A 1136507, describe tertiary alkanolamines as the accelerator known since A long time ago by the expert. A drawback is the fact that these compounds are very active nucleophilic agents and therefore saponify the ester groups used in most of the binders containing plastic materials, based on vinyl acetate-ethylene copolymers or styrene-acrylic acid esters, and destroy the activity of binders In EP-A 1136507 they are joined therefore alkanolamines in a complex way to a spine of polymer.

The document EP-A-1167317 refers to salts of water soluble aluminum containing fluoride or containing sulfate, described as setting accelerators and hardening.

In the document EP-A-894822 describes powders of dispersion based on crosslinkable polymers with aldehyde groups, keto, epoxide, isocyanate, carboxylic acid anhydride and aziridine which, among other things, can be crosslinked with polyoxyalkyleneamines present in salt form. Salt-shaped polyoxyalkyleneamines are contained in the present application as accelerators in the powder composition. He The purpose of the request does not extend accordingly to polymers with aldehyde, keto, epoxide, isocyanate, anhydride groups of carboxylic acid and aziridine.

Therefore, the object of the invention was to set provision a solution with which the use of accelerators based on alkanolamine without complex synthesis of polymers and without deterioration of the other concrete components.

The object is solved using the accelerator as an ingredient of a redispersion powder composition. Surprisingly, it has been found in this case that, despite the intervention of large quantities of organic compounds of weight Low molecular, redispersion powder properties such as block stability and fluidity are not impaired.

Object of the invention are compositions of water-reusable polymer powders with accelerating action of the setting based on homo- or copolymers of one or more monomers of the group comprising vinyl acid esters unbranched or branched alkylcarboxylic acids with 1 to 15 C atoms, esters of methacrylic acid and esters of acrylic acid of alcohols with 1 to 15 C atoms, vinyl aromatic compounds, olefins, dienes and vinyl halides, which do not contain any substituents of the group comprising aldehyde, ketone, epoxide groups, isocyanate, carboxylic acid anhydride and aziridine, one or more protective colloids, and optionally anti-blocking agents, characterized in that one or more compounds are contained NR 3 or R 2 N- (CH 2) n -NR 2 with n = 1 to 4, where the R remains are the same or different, and have the meaning of hydrogen, C 1 to C 6 alkyl moiety and moiety C 1 to C 6 hydroxyalkyl, at least one R moiety being a C 1 to C 6 hydroxyalkyl moiety, or one or several polyalkylene glycols terminated simply or doubly in NH 2 with C 1 to C 6 alkylene groups, and the compounds NR 3, R 2 N- (CH 2) n -NR 2 as well as NH2-terminated polyalkylene glycols can be also present in the form of its salts.

Simple or finished polyalkylene glycols doubly preferred in NH2 are polyethylene glycols (PEO) amino terminated simply or double, polypropylene glycols (PPO) amino terminated simply or double, as well as copolymers EO-PO terminated in amino simple or double. The compounds R 2 N- (CH 2) n -NR 2 Preferred contain 1 to 4 ethanolamine, propanolamine or isopropanolamine as well as hydrogen, methyl, ethyl and propyl moieties, and it is true that n = 2. The N, N, N'N'-tetrakis- (2-hydroxypropyl) -ethylenediamine. Preferred NR3 compounds contain 1 to 3 moieties ethanolamine or isopropanolamine as well as hydrogen, methyl, ethyl and propyl. Ethanolamine, diethanolamine are preferred, triethanolamine, N-methyldiethanolamine, triisopropanolamine and N, N-dimethylethanolamine. Be particularly preferably use triisopropanolamine, diethanolamine, triethanolamine and N-Methyldiethanolamine. As a rule, the accelerator setting component is used in an amount of 0.1 at 25% by weight, preferably 1 to 10% by weight, referred to in each case to the total weight of the powder composition. The compounds mentioned setting accelerators can also be used in form their salts with inorganic acids or, preferably, organic Salts are particularly preferred in this context. of formic and acetic acids.

Vinyl esters suitable for the polymer base are those of carboxylic acids with 1 to 15 atoms C. Esters Preferred vinyl are vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methylvinyl acetate, vinyl pivalate and vinyl esters of monocarboxylic acids α branched with 9 to 13 C atoms, for example VeoVa9® or VeoVa10® (trade names of the Shell firm). Is particularly Preferred vinyl acetate.

Esters of methacrylic acid or esters of acid Suitable acrylic are esters of unbranched alcohols or branched with 1 to 15 C atoms such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, acrylate n-butyl, n-butyl methacrylate, 2-ethylhexyl acrylate, and norbornyl acrylate. Preferred are methyl acrylate, methyl methacrylate, acrylate n-butyl and acrylate 2-ethylhexyl.

Examples of olefins and dienes are ethylene, propylene and 1,3-butadiene. Compounds Preferred vinylaromatics are styrene and vinyltoluene. A Appropriate vinyl halide is vinyl chloride.

Optionally, 0.05 can also be copolymerized. at 50% by weight, preferably 1 to 10% by weight, based on weight total of the base polymer, of adjuvant monomers. Examples of adjuvant monomers are mono- and dicarboxylic acids ethylenically unsaturated, preferably acrylic acid, acid methacrylic, fumaric acid and maleic acid; amides and nitriles of ethylenically unsaturated carboxylic acids, preferably acrylamide and acrylonitrile; mono- and diesters of fumaric acids and maleic such as diethyl and diisopropyl esters, acids ethylenically unsaturated sulfones or their salts, preferably vinyl sulfonic acid and acid 2-acrylamido-2-methyl-propanesulfonic. Additional examples are comonomers pre-crosslinkable such as comonomers poly-ethylenically unsaturated, for example adipate of divinyl, diallyl maleate, allyl methacrylate or cyanurate of trialyl, or post-crosslinkable comonomers, by example acrylamidoglycolic acid (AGA), methyl acid ester Methylacrylamidoglycol (MAGME), N-methylol-acrylamide (NMA), N-methylolmethacrylamide (NMMA), carbamate N-methylolayl, alkyl ethers such as iso-butoxy ether or ester of the N-methylolacrylamide, of the N-methylolmethacrylamide and carbamate N-methylolayl. Other examples are comonomers with silicon functionality, such as acryloxypropyltri (alkoxy) - and methacryloxypropyltri (alkoxy) -silanes, vinyltrialkoxysilanes and vinylmethyldialkoxysilanes, where as groups alkoxy may be contained eg methoxy, ethoxy and ethoxypropylene glycol ether. Monomers may also be mentioned with hydroxy groups, for example acid hydroxyalkyl esters methacrylic and acrylic acid such as acrylate or methacrylate hydroxyethyl, hydroxypropyl or hydroxybutyl.

Examples of suitable homo- and copolymers are vinyl acetate homopolymers, vinyl acetate copolymers with ethylene, copolymers of vinyl acetate with ethylene and one or several additional vinyl esters, acetate copolymers of vinyl with ethylene and acrylic acid esters, copolymers of vinyl acetate with ethylene and vinyl chloride, copolymers styrene-acrylic acid esters, and copolymers styrene-1,3-butadiene.

Acetate homopolymers of vinyl;

copolymers of vinyl acetate with 1 to 40% in ethylene weight;

copolymers of vinyl acetate with 1 to 40% in weight of ethylene and 1 to 50% by weight of one or more comonomers additional from the group of vinyl esters having 1 to 12 C atoms in the rest of carboxylic acid such as vinyl, vinyl laurate, vinyl esters of carboxylic acids branched in alpha with 9 to 13 C atoms such as VeoVa9, VeoVa10, I see Va11;

vinyl acetate copolymers, 1 to 40% by weight of ethylene and preferably 1 to 60% by weight of acid esters acrylic with unbranched or branched alcohols having 1 to 15 C atoms, particularly n-butyl acrylate or 2-ethylhexyl acrylate; Y

copolymers with 30 to 75% by weight of acetate vinyl, 1 to 30% by weight of vinyl laurate or vinyl esters of an alpha branched carboxylic acid with 9 to 11 C atoms, and 1 to 30% by weight of esters of acrylic acid with non-alcohols branched or branched having 1 to 15 C atoms, particularly n-butyl acrylate or acrylate of 2-ethylhexyl, which also contain 1 to 40% by weight of ethylene;

copolymers with vinyl acetate, 1 to 40% in weight of ethylene and 1 to 60% by weight of vinyl chloride; where the polymers may also contain adjuvant monomers mentioned in the mentioned quantities, and the percentage data in weight they are added in all cases to give 100% by weight.

Ester polymers of (meth) acrylic acid, such as acrylate copolymers of n-butyl or 2-ethylhexyl acrylate or copolymers of methyl methacrylate with acrylate of n-butyl and / or acrylate 2-ethylhexyl;

styrene-acrylic acid copolymers with one or more monomers of the methyl acrylate, acrylate group ethyl, propyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate;

vinyl acetate-acid esters copolymers acrylic with one or more monomers of the methyl acrylate group, ethyl acrylate, propyl acrylate, acrylate n-butyl, 2-ethylhexyl acrylate and optionally ethylene;

copolymers styrene-1,3-butadiene;

where polymers can also contain adjuvant monomers mentioned in the amounts indicated, and the weight percentage data are added in all cases to give 100% by weight.

The choice of the monomers or the choice of the proportions by weight of the comonomers is carried out in this context such that, as a rule, a glass transition temperature Tg of -50 ° C to + 50 ° C, preferably -30 ° C to + 40 ° C results. . The glass transition temperature Tg of the polymers can be determined in a known manner by Differential Scanning Calorimetry (DSC). The Tg value can also be pre-calculated approximately by means of the Fox equation. According to Fox TG, Bull. Am. Physics Soc. 1 , 3, page 123 (1956) is fulfilled: 1 / Tg = x_ {1} / Tg_ {1} + x_ {2} / Tg_ {2} + ... + x_ {n} / Tg_ {n}, where x_ {n} represents the mass fraction (% by weight / 100) of monomer n, and Tg_ {n} is the glass transition temperature in Kelvin degrees of the homopolymer of monomer n. Tg values for homopolymers are set out in Polymer Handbook, second edition, J. Wiley & Sons, New York (1975).

The production of homo- and copolymers is performed according to the emulsion polymerization process or according to the suspension polymerization process, preferably according to the emulsion polymerization process, the temperature being polymerization as a rule 40 ° C to 100 ° C, preferably 60ºC to 90ºC. In the case of copolymerization of comonomers gaseous such as ethylene, 1,3-butadiene or chloride Vinyl can also be worked under pressure, as a rule Between 5 bar and 100 bar.

The polymerization initiation is carried out with the initiators or redox-initiator combinations water soluble or conventional monomer soluble for emulsion polymerization or suspension polymerization. Examples Water-soluble initiators are sodium, potassium and peroxodisulfuric acid ammonium, hydrogen peroxide, peroxide of t-butyl hydroperoxide t-butyl, potassium peroxodiphosphate, peroxopivalate of tert-butyl, cumene hydroperoxide, isopropylbenzene monohydroperoxide and azobisisobutyronitrile. Examples of monomer soluble initiators are peroxy dicarbonate of dicetyl, dicyclohexyl peroxydicarbonate, and peroxide of dibenzoyl. The mentioned initiators are used as a rule in an amount of 0.001 to 0.02% by weight, preferably 0.001 to 0.01% by weight, in all cases referred to the total weight of the monomers

As redox-initiators are used combinations of the initiators mentioned with reducing agents. Suitable reducing agents are the sulphites and bisulfites of the alkali and ammonium metals, for example sodium sulphite, sulfoxyl acid derivatives such as formaldehydesulfoxylates zinc or alkaline, for example sodium hydroxymethanesulphinate, and ascorbic acid. The amount of reducing agent is as a rule 0.001 to 0.03% by weight, preferably 0.001 to 0.015% by weight, referred in all cases to the total weight of the monomers.

For molecular weight control they can regulators are used during polymerization. In case if regulators are used, these are conventionally used in amounts between 0.01 and 5.0% by weight, based on the monomers to polymerize, and are dosed separately or mixed previously with the reaction components. Examples of such substances are n-dodecylmercaptan, tert-dodecylmercaptane, mercaptopropionic acid, mercaptopropionic acid methyl ester, isopropanol and acetaldehyde

Appropriate protective colloids are polyvinyl alcohols; polyvinyl acetals; polyvinylpyrrolidones; polysaccharides in water soluble form such such as starches (amylose and amylopectin), celluloses and their derivatives substituted with carboxymethyl, methyl, hydroxyethyl, or hydroxypropyl; proteins such as casein or caseinate, protein of soybeans and jellies; ligninsulfonates; synthetic polymers such as polyacid (meth) acrylic, copolymers of (met) acrylates with comonomer units that have carboxyl functionality, poly (meth) acrylamide, acids polyvinyl sulfones and their water soluble copolymers; melamine formaldehyde sulphonates, naphthalene-formaldehyde sulphonates, and copolymers of styreneomaleic acid and vinyl ether maleic acid.

Partial poly (vinyl alcohols) are preferred or fully saponified with a degree of hydrolysis of 80 to 100% molar, particularly polyvinyl alcohols partially saponified with a degree of hydrolysis of 80 to 95% molar and a Höppler viscosity, in 4% aqueous solution, from 1 to 30 mPas (method according to Höppler at 20 ° C, DIN 53015). They are also preferred partially saponified polyvinyl alcohols and hydrophobically modified with a hydrolysis degree of 80 to 95% in Höppler weight and viscosity, in 4% aqueous solution, from 1 to 30 mPas. Examples of these are partially saponified copolymers of vinyl acetate with hydrophobic comonomers such as acetate of isopropenyl, vinyl pivalate, vinyl ethylhexanoate, branched saturated monocarboxylic acid vinyl esters in alpha with 5 or 9 to 11 C atoms, dialkyl maleates and fumarates of dialkyl such as diisopropyl maleate and fumarate of diisopropyl, vinyl chloride, vinyl alkyl ethers such as vinylbutyl ether, and olefins such as ethylene and decene. The proportion of hydrophobic units is preferably 0.1 to 10% by weight, based on the total weight of the polyvinyl alcohol partially saponified Mixtures of the polyvinyl alcohols mentioned.

In most cases they are preferred polyvinyl alcohols with a degree of hydrolysis of 85 to 94% molar and a Höppler viscosity, in 4% aqueous solution, from 3 to 15 mPas (method according to Höppler at 20 ° C, DIN 53015). Colloids mentioned protectors can be obtained by known processes by the expert and are added as a rule during the polymerization in a total amount of 1 to 20% by weight, based on total weight of the monomers.

If it polymerizes in the presence of emulsifiers, the amount of these is 1 to 5% by weight based on the amount of monomers Appropriate emulsifiers are anionic emulsifiers, cationic and non-ionic, for example surfactants anionic, such as alkyl sulfates with a chain length of 8 to 18 C atoms, alkyl- or alkylarylether sulfates with 8 to 18 C atoms in the hydrophobic moiety and up to 40 units ethylene oxide or oxide propylene, alkyl- or alkylarylsulfonates with 8 to 18 C atoms esters and semi esters of sulfosuccinic acid with alcohols monovalent or alkylphenols, or non-ionic surfactants such as alkyl polyglycol ethers or alkylaryl polyglycol ethers with 8 to 40 units ethylene oxide.

Once the polymerization is finished, you can perform a post-polymerization for separation of residual monomers using methods known as a general rule for post-polymerization initiated with catalysts redox. Volatile residual monomers can also be separated by distillation, preferably under reduced pressure, and eventually with passage through the reaction mixture or in contact with the surface of inert scanning gases such as air, nitrogen or water vapor. The aqueous dispersions obtained in this way they have a solids content of 30 to 75% by weight, preferably 50 to 60% by weight.

For the production of polymer powders Redispersible in water, aqueous dispersions, optionally after the addition of protective colloids as adjuvants of nozzle projection, dried, for example by drying in fluidized bed, lyophilization or spray drying. Preferably, the dispersions are dried by spray. Spray drying is performed in this case. in conventional spray drying facilities, being able to realize the atomization by means of nozzles of one, two or more materials or with a rotating disk. The outlet temperature is select as a rule within the range of 45 ° C to 120 ° C, preferably 60ºC to 90ºC, depending on the installation, the value Tg of the resin and the desired degree of drying.

As a rule, the nozzle projection adjuvant (protective colloid), is used in a total amount of 3 to 30% in weight, referring to the polymer constituents of the dispersion. Is say, the total amount of protective colloid before Drying procedure should be 3 to 30% by weight, referred to polymer content; preferably 5 to 20% by weight is used, referred to polymer content.

Appropriate spray adjuvants are partially saponified polyvinyl alcohols; polyvinylpyrrolidones; polysaccharides in water soluble form such such as starches (amylose and amylopectin), celluloses and their derivatives substituted with carboxymethyl, methyl, hydroxyethyl e hydroxypropyl; proteins such as casein or caseinate, protein of soybeans and jellies; ligninsulfonates; synthetic polymers such as poly (meth) acrylic acid, copolymers of (met) acrylates with comonomer units that have carboxyl functionality, poly (meth) acrylamide, acids polyvinyl sulfones and their water soluble copolymers; melamine formaldehyde sulfonates, naphthalene formaldehyde sulfonates, and styrene-maleic acid and vinyl ether-maleic acid copolymers. Preferably, no additional protective colloid is used anymore that polyvinyl alcohols as adjuvants of spray.

In spraying, many have been proven times a content of up to 1.5% by weight of agent is favorable antifoam, referred to the base polymer. To increase the storage stability by improving stability at blockage, particularly in the case of powders with temperature of relatively low glass transition, the dust obtained can conditioning with an anti-blocking agent (anti-caking agent), preferably up to 30% by weight, based on the total weight of polymer constituents. Examples of anti-blocking agents are Ca or Mg carbonate, talc, gypsum, silica, kaolin and silicates with particle sizes preferably in the range of 10 nm at 10 µm.

The viscosity of the feed material at spray nozzle is adjusted through the solids content of such that a value of <500 mPas is obtained (viscosity Brookfield at 20 revolutions and 23 ° C), preferably <250 mPas. The solids content of the dispersion to be projected per nozzle is > 35%, preferably> 40%.

In the case of nozzle projection, they can add other additives to improve the technical properties of application. Additional ingredients of the compositions of dispersion powders contained in preferred embodiments they are for example pigments, fillers, foam stabilizers, and hydrophobicizing agents

For the production of the powder composition of polymer, the setting accelerator component is added immediately before spray drying the dispersion of corresponding polymer, in order to keep as short as possible the Time for saponification processes. In the case of the employment of accelerating component of salt, amine or amino-terminated polyalkylene glycol is previously neutralized with an acid and sprinkled in salt form with the dispersion to give the dust Optionally, the setting accelerator component can also be added after drying in powder form. To do this, it deposit it on a powdery support material, for example silica.

The polymer powder compositions Redispersible in water can be used in the fields of application Typical for them. For example in chemicals for construction, optionally in association with binders that hydraulically forge such as cement, (Portland cement, from aluminate, pozzolanic, steel, magnesia, phosphate), plaster and soluble glass, for the production of adhesives for construction, particularly tile adhesives and adhesives of total thermal insulation, plasters, plaster compositions ordinary, plaster compositions for floors, leveling compositions, waterproofing grouts, mortars for joints and paints. Preferred fields of application are injection mortars and injection concretes for work construction of elevated buildings and public works, as well as for the lining of tunnel walls.

The advantage of the powder composition of Redispersible polymer is based on the fact that in this way solid presentation can no longer take place reactions of saponification and therefore the binder is not affected. An additional advantage is the fact that the operator has to manipulate one less component at the work point and the manipulation in the form of a solid presentation is easier than the treatment with flammable organic liquid compounds such as alkanolamines

Examples Polymer dispersion

As dispersion a dispersion was used stabilized with polyvinyl alcohol of a copolymer based on vinyl acetate and ethylene. The production was done by emulsion polymerization. For stabilization it used 10% by weight of a polyvinyl alcohol with a grade of saponification of 88% molar and a viscosity according to Höppler of 4 mPas. The copolymer composition was 92% by weight of acetate vinyl and 8% by weight of ethylene.

Redispersion powder

The powders were produced by drying by spraying of the aforementioned dispersion with accelerator addition and 8% by weight of a polyvinyl alcohol with a degree of saponification of 88% molar and a viscosity according to Höppler of 4 mPas.

The dispersion was pulverized by a nozzle of two materials As a projection component, air was used precompressed at 4 bar, and the droplets formed were air dried heated to 125 ° C in parallel. The dry powder obtained was mixed with 10% by weight of a commercial anti-blocking agent (carbonate mixture calcium-magnesium and magnesium hydrosilicate).

Accelerators

The alkanolamines were used, or directly, or previously mixed with the equimolar amount of formic acid (FA), or adjusted to a pH value of 5 to 6. It they used the following alkanolamines:

MDEA = N-Methyldiethanolamine TORCH = triethanolamine DEA = diethanolamine TPA = triisopropanolamine

essays

The powders obtained were tested regarding its dust properties and regarding the activity of the concrete accelerator.

Fluency

The fluidity was estimated optically by the discharge cone configuration.

Determination of block resistance

For the determination of resistance to blockage, dispersion powder was introduced into an iron tube with threaded closure and then loaded with a metal piston. After of the load, it was kept in the drying cabinet for 16 hours at 50 ° C After cooling to room temperature, the powder will removed from the tube and the stability was qualitatively estimated at Dust crushing block. Stability to blockage is classified as follows:

one - 3 = blocking stability very good 4 - 6 = stability to good lock 7-8 = stability to sufficient blocking 9-10 = no stable to blockage, the powder after crushing was no longer fluid.

Determination of the sedimentation behavior RA

The sedimentation behavior of the Redispersion serves as a measure of dust redispersibility. Redispersions were prepared at 50% by weight in water by application of intense shear forces.

Sedimentation behavior was evaluated. then on diluted redispersions (0.5% solids content), and for this 100 ml of this dispersion was introduced into a tube graduated, and the sedimentation height of the solids was measured. He data is expressed in mm of sedimentation after 24 hours. Values greater than 7 indicate insufficient redispersion of dust.

Determination of setting behavior (curve thermal)

System setting behavior cementitious was determined during the use of the powder by observation of the heat of hydration. The measurement was performed for a factor plastic-cement of 0.1 and a factor water-cement 0.4. The measure was used CEM I 42.5R class cement from Rohrdorf. The magnitude of measure is the temperature of the mass that is determined by a measuring probe The time to the extent of the maximum temperature.

The test results are shown in the Table one.

From the data it can be recognized that the Powder properties are not adversely affected. The fluidity, blocking stability and redispersability are maintained essentially unchanged. On the contrary, the positive effect on the setting of cement is clearly appreciable. Measures indicate, as required, a temperature development clearly accelerated.

TABLE 1

one

Claims (10)

1. Water redispersible polymer powder compositions with accelerating setting action based on homo- or copolymers of one or more monomers of the group comprising vinyl esters of unbranched or branched alkylcarboxylic acids with 1 to 15 C atoms, methacrylic acid esters and acrylic acid esters of alcohols with 1 to 15 C atoms, vinyl aromatic compounds, olefins, dienes and vinyl halides, which do not contain any substituents of the group comprising aldehyde, ketone, epoxide, isocyanate, carboxylic acid anhydride and aziridine groups, one or more protective colloids, and optionally anti-blocking agents, characterized in that one or more NR 3 or R 2 N- (CH 2) n-NR 2 compounds are contained with n = 1 a 4, where the R moieties are the same or different, and have the meaning of hydrogen, C 1 to C 6 alkyl moiety and C 1 to C 6 hydroxyalkyl moiety, at least one R moiety being a moiety hydroxyalkyl C 1 to C 6, or one or more polyalkylene glycols terminated simply or doubly are contained in NH 2 with C 1 to C 6 alkylene groups, and the compounds NR 3, R 2 N- (CH2) n -NH2 as well as polyalkylene glycols terminated in NR2 may also be present in the form of their salts. 2. Water redispersible polymer powder compositions according to claim 1, characterized in that the NR3 compounds contain one to three ethanolamine or isopropanolamine residues as well as hydrogen, methyl, ethyl and propyl radicals, the compounds R 2 N- (CH 2) n -NR 2 contain 1 to 4 ethanolamine, propanolamine or isopropanolamine residues as well as hydrogen, methyl, ethyl and propyl moieties and n = 2 and the polyalkylene glycols terminated in NH2 they are polyethylene glycols (PEO) terminated in simple amino or doubly, polypropylene glycols (PPO) terminated in simple amino or doubly, as well as EO-PO copolymers terminated in amino simple or double. 3. Water redispersible polymer powder compositions according to claim 1 or 2, characterized in that the setting accelerator compounds are used in the form of their salts of inorganic or organic acids. 4. Water-redispersible polymer powder compositions according to claims 1 to 3, characterized in that homopolymers of vinyl acetate, copolymers of vinyl acetate with ethylene, copolymers of vinyl acetate with ethylene and one or more are used as homo- or copolymers. several additional vinyl esters, copolymers of vinyl acetate with ethylene and esters of acrylic acid, copolymers of vinyl acetate with ethylene and vinyl chloride, styrene-ester copolymers of acrylic acid, and styrene-1,3-butadiene copolymers. 5. Water redispersible polymer powder compositions according to claims 1 to 4, characterized in that partially or fully saponified polyvinyl alcohols are used as protective colloids, if hydrophobically modified with a degree of hydrolysis of 80 to 100%. molar and Höppler viscosity, in 4% aqueous solution, from 1 to 30 mPas (method according to Höppler at 20 °, DIN 53015). 6. Water redispersible polymer powder compositions according to claims 1 to 5, characterized in that the setting accelerator component is contained in an amount of 0.1 to 25% by weight, based on the total weight of the powder composition. 7. Process for the production of water-redispersible polymer powder compositions according to claims 1 to 6, characterized in that the setting accelerator component is added immediately before spray drying to the corresponding polymer dispersion or sprinkled in the form of salt with the polymer dispersion to give the powder, or it is added after drying in powder form. 8. Use of powder compositions of water-redispersible polymer according to claims 1 to 6, in construction chemicals, in association with binders that forge hydraulically such as cement, plaster and soluble glass 9. Use of powder compositions of water redispersible polymer according to claims 1 to 6, for the production of construction adhesives, adhesives for Total thermal insulation tiles and adhesives, plasters, ordinary plaster compositions, compositions of plastered for pavements, leveling compositions, grouts of waterproofing, mortars for joints and paints. 10. Use of powder compositions of water redispersible polymer according to claims 1 to 6 for injection mortars and injection concrete for jobs of construction of elevated buildings and public works as well as for the lining of tunnel walls.